When travelling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Inverness is roughly similar to Zanzibar. You can assume this to be the case over the next 8 days.
Temperatures around the 26 °Cs can be experienced in December. The weather in Zanzibar is hotter than in Inverness. Plan for potential changes in flight availability as peak weather approaches in this location.